mpeg 1 layer 3 codec

provides software-only MPEG Layer III audio encoding solutions

Instructions for installing Microsoft MPEG-4 V1/2/3 VKI Codec.

includes: Codecs, Documentation and Sample Applications.

Microsoft video codecs pack

MPEG 1 layer 1/2/3 (mp3), MPEG 2, and MPEG 2.5 audio file editor